Guardians of the Stars

WISE 0855 0714

WISE 0855–0714 (full designation WISE J085510.83–071442.5) is a (sub-)brown dwarf 7.175+0.783 −0.652 light-years (2.2+0.24 −0.2 parsecs) from Earth. it has the third-highest proper motion (8.072±0.026 mas/yr) and the fourth-largest parallax (448±32 mas) of any known star or brown dwarf, meaning it is the fourth closest extrasolar system to the Sun. It is also the coldest object of its type found in interstellar space, having a temperature between 225 to 260 K (−48 to −13 °C; −55 to 8 °F).

Based on models of brown dwarfs WISE 0855–0714’s is estimated to have a mass of 3 to 10 MJ. This mass is in the range of a sub-brown dwarf or other planetary mass object. A lighter object and one orbiting another object is considered a planet. This WISE object is alone, so it most likely should be a rogue planet.